Telephone system



No, 897,239. PATENTED AUG. 25, 1908.

H. G. WEBSTER. TELEPHONE SYSTEM.

APPLICATION FILED MAR. 5, 1906.

A/rm' 57 7 THE Nmawls PEIEKs (2a., WASHINOTDN. o c

UNITED STATES PATENT OFFICE.

Gr. WEBSTER, OF CHICAGO, ILLINOIS, ASSIGNOR TO MILO Gr. KELLOGG, OFCHICAGO,

ILLINOIS.

HARRY TELEPHONE SYSTEM.

Patented Aug. 25, 1908.

filed March 5, 1906. Serial No. 304,227.

Application series with a condenser 2, included in a normally closedbridge of the telephone line limbs 3-4 by the engagement of theswitchhook 5 with the contact second bridge,

normally open and including the transmitter 7 and receiver 8,

T 0 all whom it may concern:

Be it known that I, HARRY Gr. Wnnsrnn, a citizen of the United States,and residing at Chicago, county of Cook, and State of linois, haveinvented new and useful Improvemerits in Telephone Systems, of which theis closed at the contact 9 by following is a clear, concise, full, andexact the switch-hook 5 whenever specification. removed therefrom;

The present invention relates to manual At the central o'ice, Rdesignates the telephone systems generally, and more parpolarizedrepeating coil relay by which the ticularly to that type in which .thevarious line 3-4 is inductively united to the jacks telephone lines,extending to the central 0 10. This relay comprises a soft iron core 11fice, are inductively united for conversation provided with suitablepole pieces 12 and a through the agency of repeating coils,interpermanent polarizing magnet 13 which carposed between the lines andtheir connection ries the armature 1 1, normally held in enterminals,and a link-circuit for conductively gageinent with the 'IlXGCl stop 15by a spring interconnecting these termina s. 16, but adapted to engagethe contact .17 in The principal o ject of the invention is to responseto the energization of the relay. rovide a system of this type with anovel ar- The relay is also provided with two differen rangeinent ofcircuits and apparatus for contially arranged energizing windings. Onetrolling the usual line and supervisory sig of these, designated 18, isshown in two secnals.

In carrying out my tioiis connected respectively between the invention,I associate opposite poles of the battery 19 and the line a polarizedrepeating coil relay with each limbs S t. The other, designated 20, istelephone line. Each relay through its permanently connected to acircuit eXtend windings inductively unites the line. to its ing from thejacks 10 to grounr, either by terminals, and by its contacts, controlsthe way of the resistance 21 or the non-resistance path including thecontacts 2223 of a control relay 24 under the direct control of thesubscriber. This latter relay is provided with the winding 25, shown intwo sections, connected respectively between the opposite poles of thebattery 19 and the line limbs 3 4, in parrallel with the correspondingsections of the repeating coil relay win ing 18. The armature 1 1 isconnecte. to ground, while its contact 17 is connected to the live poleof the battery 19 through the line lamp 26.

The equipment and the connections thus far described with reference tosubstation A are duplicated in connection with substation B, and thecorresponding parts are there indicated by similar primed characters.

At the central office, connecting the jacks 10 single strand made up ofsections 27 27 uniting the answering and calling pl and 28 respectivelyand being con uc ively separated a condenser 29, which by will permitthe passage of voice currents but line signa. The windings arerespectively under the control of the subscriber and operator-the formerto energize the relay to cause the attraction of its armature, and thelatter to deenergize it to cause he armature to return to its normalposition. An additional relay, also under the control of the subscriber,is employed to cut resistance into and out of circuit with theassociated line terminals, so as to cause the eflaceinent or allow thedisplay of the supervisory signal upon the connection of thelink-circuit to the terminal.

The character of the invention, together with its various features andadvantages, will be more fully understood upon reference to thefollowing detailed description taken in connection with the accompanyingdrawing, and the scope of the invention will be particularly indicatedin the appended claims.

In the drawing, which illustrates diagrammatically a telephone system.constructed in accordance with the present invention, and B designatetwo substations which are connected to the central oflice C by suitablethe link circuit for and 10 comprises a telephone lines. The equipmentat substa prevent the passage of current from the battion A, which maybe of any preferred type, tery 19. The supervisory signals, whichconsist of the lamps is here shown as comprising a call-bell 1 in 30-50, are connected 50 the latter into effective circuit relation in the 6ing 18 sufficiently to allow its armature 14 to lamp to cause itsextinguishment. With 130 each in series with a corresponding impereturn,to its normal position, thusinterruptdance 31*31, between the live poleof the ing the circuit of the line lamp 26 to causeits battery 19 andthe strand sections 27 and extinguishment. The current flowing over 7respectively. The usual listening key 32 this circuit, however, will beinsuflicient to 5 is adapted to complete a branch from the illuminatethe supervisory lamp because strand section 27 to ground, including the.0 the presence of the resistance 21 in circuit. condenser 33, operatorsreceiver 34 and While the listening-key'remains depressed, the operatorsreceiver will be included in a e primary winding of the induction coilis I secondary circuit extending from the ground 10 included in a localcircuit in series with the therepeating coil 35, through the seconda tipcontact on the calling plug 28 and jack 10, repeating coil relay winding20 and 15 ground. The strandsection 27 is also proresistance 21, toground. Upon learning the vided with a ringing key 38 which normallywishes of the calling party, the operator will engages the contact 39 tomaintain the con touch the tip contact of the calling plug 28 againstthe testing contact of the jack 10 to determine the idle or busycondition of the line. If the line is busy, a potential above that ofground will exist at the testing contact of the jack by reason of itsconnection through a multiple jack and a connected linkcircuit to thelive pole of the battery. Consequently,upon touching the tip contact ofthe plug 28 to the jack, a flow of current will result through thetertiary winding of the induction coil 35, and the usual click willdepressed into engagement with the contact 20 40 to connect the sleevecontact of the plug 28 to one pole of the calling generator 41,

25 substation A, desiring to converse with a party at substation B,removes his receiver from its hook, and thereby completes a cir ciutthrough the winding 18 of the repeating coil relay R. his circuit may betraced 30 from the live pole of the battery 19, through cation to herthat the hue is busy. If the the lower section of the winding 18, linelimb line is found to be idle, the operator will 4, the closed bridge atthe substation, the insert the calling plug 28 into the jack 10 linelimb 3, t e upper section of the winding and depress her ringing-key 38,thereby 18 to the grounded pole of the battery. At closing a primarycircuit from the grounded 35 the same time, a circultis completedthrough side of the battery 19, through the batter the sections of thewinding 25 of the control condenser 42, the calling generator 41,ringrelay in parallel with the sections of the winding-key contacts40-38, plug 28, jack 10, ing 18, so that both the repeating coil relaywinding 20 of the repeating coil relay R and resistance 21, to ground.The alternatin current supplied. by the generator 41 to this 10 40attract their armature contacts. The at winding 18 of the repeating 0011relay, the

line limbs 34and the call-bell lto actuate the latter. Before the callis answered by the party at substation B, and after the plug 28 has beeninserted, a circuit through the supervisory lamp 30 will exist asfollows:

from the live pole of the battery 19, through the impedance 31,supervisory lamp 30,

strand section 27, plug 28, jack 10, repeat ing coil relay winding 20,control relay contacts 2223 to the grounded side of the battery. Byreason of the exclusion of the re- 55 10 and depress her listening-key32 to detersistance 21., the flow of current through the mine the wishesof the calling party. The lamp 30 will be suficient to cause itsillumiact of inserting the plug will close a circuit l nation and itwill remain in this condition from the live pole of the battery 19,through until the call is answered at substation B. the impedance 31,supervisory lamp 30, Upon this latter event, a-circuit will be com- 60strand section 27, plug 28, jack 10, repeating pleted through thewindings 25 of the con coil relay winding 20 and resistance 21, to trolrelay 24, which will energize the latter ground. The completion of thiscircuit will sufliciently to remove the short circuit from energize therepeating coil relay in opposiaround the resistance '21 and include thetion to the energization caused by the windlatter directly in' circuitwith the supervisory 45 lamp 26 to cause its illumination, as a signalwill insert the answering plug 28 into a ack subscriber for subsequentlyreturning said the parties so connected, the supervisory relay contactsto lamps 30 and 30 will remain dark during conversation, but as soon aseither party their normal position, thereby efiacing said signal.

hangs up his receiver, the corresponding 4. A telephone systemcomprising a telelamp will be illuminated, and the illumina phone lineextending from a substation to a tion of both lamps will be a signal tothe central ofiice, a connection terminal for said operator todisconnect. line, a re eating coil relay having windings Obviously, thebatteries 19 and 37, here inductive yuniting said line to said terminal,shown separately, may be one and the same, a link-circuit for makingconnection to said and the various ground connections are to be terminalto establish a conversational cirunderstood as representing, equallywell, cuit, means under the control of the sub connections to a commonofiice return. scriber for energizing said relay to cause a will beapparent also that certain alterations complete movement of its armaturefrom and modifications may be made in the matits normal position, saidmovement being ter disclosed without departing from the under the solecontrol of the subscriber, a spirit and scope of my invention. 1, thereline signal displayed in response to such fore, do not wish to belimited to the specific movement, a signal associated with saidlinkdisclosure, but aim to cover, by the terms of circuit, meansoperative upon the connection the appended claims, all such alterationsand of said link-circuit to said. line to establish modifications. acircuit normally to display said signal, a l/Vhat I claim as new anddesire to secure resistance, and an additional relay under by LettersPatent of the United States is the sole control of the subscriber forinclud- 1. A telephone system comprising a tele ing said resistance insaid circuit to cause the phone line extending from a substation to aeiiacement of said signal. central ofiice, a connection terminal forsaid 5. A telephone system comprising a tele line, a polarized repeatingcoil relay having hone line extending from a substation to a windingsinductively uniting said line to central office, a connection terminalfor said said terminal, a signal controlled by the reline, a repeatingcoil relay having windings lay contacts, means under the control of theinductively uniting said line to said terminal, subscriber forenergizing said repeating coil a link-circuit for making connection tosaid relay normally to cause the display of said terminal to establish aconversational cirsignal, and means under the control of the cuit, meansunder the sole control of the operator for modifying said energizationtosubscriber for energizing said relay to cause return the relay contactsto their normal a movement of its armature by closing a relativeposition. circuit through one of said repeating coil 2. A telephonesystem comprising a telerelay windings, a line signal displayed inrephone line extending from a substation to a sponse to such movement, asignal associcentral oflice, a connection terminal for said ated withsaid link-circuit, means operative line, a polarized repeating coilrelay having upon the connection oi said link-circuit to windingsinductively uniting said line to said line normally to display saidlink-cirsaid terminal, a signal controlled by said cuit signal byclosing a circuit through the relay contacts, means under the control ofa other repeating coil relay winding, a resistsubscriber for completinga circuit through ance, a second relay having its energizing one of saidwindings to energi e said relay to windings connected in bridge of saidtelecause the display of said signal, and means hone line and operativeto include said under the control of the operator for comresistance insaid link-circuit signal-displaypleting a circuit through the otherrelay ing circuit to cause the ei'liacement of said winding to modifysaid energization' to signal. return said relay contacts to their normal6. A telephone system comprising a teleposition and thereby efi'ace saidsignal. hone line extending from a substation to a A telephone systemcomprising a telecentral office, a connection terminal for said honeline extending from a substation to a line, a polarized repeating coilrelay having central oflice, a connection terminal for said windingsinductively uniting said line to said line, a polarized re eating coilrelay having terminal, alink-circuit for making connection windingsinductive y. uniting said line to to said terminal to establish aconversational said terminal, a link-circuit for making concircuit,means under the control of the subnection to said terminal to establisha conscriber for completing a circuit through one versational circuit, asignal associated with of the repeating coil relay windings to causesaid line, a signal associated with said linka complete movement of itsarmature, a line circuit, means operative upon the connection signaldisplayed in response to such moveof said link-circuit to said terminalto supment, a signal associated with said link-cirly current over acircuit including one of cuit, means operative upon the connection ofthe repeating coil relay windings norma ly said link-circuit to saidline to complete a cirto cause the display of said link-circuit cuitthrough the other repeating coil relay signal, and' means under thecontrol of the winding normally to display said signal, a resistance,and an additional relay under the control of the subscriber forincluding saidcause the return 0011 relay armature to etl'ace resistancein said circuit to of the repeating said signal.

7. A telephone system comprising a telephone line extending from asubstation to a central oilice, a connection terminal for said line, apolarized repeating coil relay having windings inductively uniting saidline to said terminal, a link-circuit for making connection to saidterminal to establish a conversa tional circuit, means under the controlof the subscriber for completing a circuit through one of the repeatingcoil relay windings to cause a movement of its armature, a line sig naldisplayed in response to such movement, a signal associated with saidlink-circuit, means operative upon the connection of said link-circuitto said line to complete a circuit through. the other repeating coilrelay winding normally to display said. signal, a resistance, and. anadditional relay having its energizing windings connected in bridge ofthe telephone line and operative to include said resistance in said.link-circuit signal-displaying circuit to cause the ell'acement of saidsignal.

' 8. A telephone system comprising a telephone linefextending from asubstation to a central office, a connection terminal for said line, arepeating coil relay having differentially arranged windings inductivelyuniting said line to said terminal, means under the control of thesubscriber for supplying cur rent to one of said. windings to energizesaid relay to cause the attraction of its armature, means under thecontrol of the operator for supplying current to the other winding todecrease said energization to allowthe arma I ture to fall back, asignal displayed in response to the attraction of the armature andefl'aced in response to its return.

9. A telephone system comprising a telephone line extending from asubstation to a central office, a connection terminal for said line, arepeating coil relay having difierentially arranged windings inductivelyuniting said line to said terminal, a link-circuit for making connectionto said terminal to establish a conversational circuit, means under thecontrol of the subscriber for completing a circuit through one of therepeating coil relay windings, means operative upon the connection bythe operator of said link-circuit to said. terminal to complete acircuit through the other repeating coil relay winding, means fordisplaying a signal in response to the closure of the subscriberscircuit and for effacing said. signal in response to the additionalclosing of the operators circuit, a signal associated with saidlink-circuit, and means for displaying said. signal upon the closure ofthe said operators circuit only and for eflaeing said. signal upon theadditional closure of said subscribers circuit.

10. A telephone system comprising a telephone line extending from asubstation to a central olfice, a connection terminal for said line, arepeating coil relay having differentially arranged windings inductivelyuniting said line to said terminal, a link-circuit for makingconnectionto said terminal to estab lish. a conversational circuit, means underthe control of the subscriber for completing a circuit through one ofthe repeating coil relay windings, means operative upon the connectionby the operator of said. link-circuit to said. terminal to complete acircuit through the other repeating coil relay winding, means fordisplaying a signal in response to the closure of the subscribeflscircuit and for effacing said signal in response to the additionalclosing of the operators circuit, a signal asso ciated with saidlink-circuit, a resistance, means for displaying said signal upon theclosure of said operators circuit, and means actuated by the closing ofthe subscribers circuit o include said resistance in said operatorscircuit to efl ace said signal.

In witness whereof, I hereunto subscribe my name this 3rd day of March,1906.

HARRY G. WEBSTER.

Witnesses:

A. H. DYsoN, GEO. E. MUELLER.

